Colony breeding birds of Bird Island and the northern revetment at Outer Harbour, South Australia, July 2015-June 2017

Bird Island and the Northern Revetment mound are artificial islands on the north-western periphery of urban Adelaide within the Port River-Barker Inlet estuary (figure 1; Johnston & Harbison 2005). The northern revetment is an un-vegetated cement and rock breakwater located 700 m offshore from Outer Harbour. Construction of the revetment was completed in 1913 (Ritter 2005). The height of the original concrete revetment was increased by two metres with the addition of large boulders in 1962 (Vincent 1988). Bird Island is located on the Section Bank at the eastern end of the northern revetment. Bird Island was created from sand and clay spoil dredged from the Port River in 1976 (Vincent 1988).